How to call non-static Java method in QtActivity from C++/Qt

[Phataas]

Eskil Abrahamsen Blomfeldt has a post on his blog showing how to call QtActivity/(HangmanActivity) static Java methods from C++ "here":http://blog.qt.digia.com/blog/2013/12/12/implementing-in-app-purchase-on-android/.

He mentions that he only uses static methods because this is easier (indeed) and nothing more is needed in his example. Quote:

bq. In my game, the Activity is a singleton, so I store a static reference to the object in the constructor. (My C++ Data class has the same logic. I’m doing this so that I can facilitate the communication between the Java and the C++ code using static methods. For a more complex example, it’s also possible to store references and pointers in each C++ and Java object that maps it to its equivalent in the other language, but that is not necessary in this game.)

Calling the static method works. Calling the non-static method does not work(function is never entered). If I call the non-static method connectBluetooth() in onCreate() it works. Is there a way to be able to call and not have the non-static method in onCreate()?

I figured I'll add some code. I have extended the QtActivity class:

@package org.qtproject.qt5.android.bindings;

import org.qtproject.qt5.android.bindings.QtApplication;
import org.qtproject.qt5.android.bindings.QtActivity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import java.lang.String;

public class MyActivity extends QtActivity
{
private BluetoothAdapter bluetoothAdapter;
private static final int ENABLE_BLUETOOTH_REQUEST = 1;

    public MyActivity()
    {
        Log.d(QtApplication.QtTAG, "MyActivity constructor called");
    }

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onDestroy()
    {
        super.onDestroy();
    }

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
            Log.d(QtApplication.QtTAG, "onActivityResult entered");
    if(requestCode == 1)
    {
        if(requestCode == 1)
        {
            if(resultCode == RESULT_OK)
            {
                                    Log.d(QtApplication.QtTAG, "User accepted to enable Bluetooth");
            }
            else if(resultCode == RESULT_CANCELED)
            {
                                    Log.d(QtApplication.QtTAG, "User declined to enable Bluetooth");
            }
        }
    }
}

    public void connectBluetooth()
    {
        Log.d(QtApplication.QtTAG, "connectBluetooth() entered");
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if(bluetoothAdapter == null)
        {
            Log.d(QtApplication.QtTAG, "Bluetooth adapter is not found");
            return;
        }

        if(!bluetoothAdapter.isEnabled())
        {
            Log.d(QtApplication.QtTAG, "Bluetooth is off");
            Intent enableBluetoothIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBluetoothIntent, ENABLE_BLUETOOTH_REQUEST);
        }
    }

    public static void test()
    {
        Log.d(QtApplication.QtTAG, "Static Test OK!");
    }

}@

and I try to call these methods from this C++ class:

@#include "bluetooth.h"
#include <QtAndroidExtras>
#include <QDebug>

Bluetooth::Bluetooth(QObject *parent) :
QObject(parent)
{
}

void Bluetooth::connect()
{
//Test static call
QAndroidJniObject::callStaticMethod<void>("org/qtproject/qt5/android/bindings/MyActivity", "test");

//Test non-static call
//Line below creates a new object and is a subclass of QtActivity.
bluetooth = new QAndroidJniObject("org/qtproject/qt5/android/bindings/MyActivity");

if(!bluetooth->isValid())
{
    qDebug() << "bluetooth is an invalid java object";
    return;
}

bluetooth->callMethod<void>("connectBluetooth");

}@

[Phataas]

Post was to large so I have to put the AndroidManifest.xml here:

@<?xml version='1.0' encoding='utf-8'?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" package="org.qtproject.example.AndroidTest" android:versionName="1.0" android:installLocation="auto">
<application android:label="@string/app_name" android:name="org.qtproject.qt5.android.bindings.QtApplication">
<activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|locale|fontScale|keyboard|keyboardHidden|navigation" android:label="@string/app_name" android:name="org.qtproject.qt5.android.bindings.MyActivity" android:screenOrientation="unspecified">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<meta-data android:value="AndroidTest" android:name="android.app.lib_name"/>
<meta-data android:resource="@array/qt_sources" android:name="android.app.qt_sources_resource_id"/>
<meta-data android:value="default" android:name="android.app.repository"/>
<meta-data android:resource="@array/qt_libs" android:name="android.app.qt_libs_resource_id"/>
<meta-data android:resource="@array/bundled_libs" android:name="android.app.bundled_libs_resource_id"/>
<!-- Deploy Qt libs as part of package -->
<meta-data android:value="1" android:name="android.app.bundle_local_qt_libs"/>
<meta-data android:resource="@array/bundled_in_lib" android:name="android.app.bundled_in_lib_resource_id"/>
<meta-data android:resource="@array/bundled_in_assets" android:name="android.app.bundled_in_assets_resource_id"/>
<!-- Run with local libs -->
<meta-data android:value="1" android:name="android.app.use_local_qt_libs"/>
<meta-data android:value="/data/local/tmp/qt/" android:name="android.app.libs_prefix"/>
<meta-data android:value="plugins/platforms/android/libqtforandroidGL.so:lib/libQt5QuickParticles.so" android:name="android.app.load_local_libs"/>
<meta-data android:value="jar/QtAndroid.jar:jar/QtAndroidAccessibility.jar:jar/QtAndroid-bundled.jar:jar/QtAndroidAccessibility-bundled.jar" android:name="android.app.load_local_jars"/>
<meta-data android:value="" android:name="android.app.static_init_classes"/>
<!-- Messages maps -->
<meta-data android:value="@string/ministro_not_found_msg" android:name="android.app.ministro_not_found_msg"/>
<meta-data android:value="@string/ministro_needed_msg" android:name="android.app.ministro_needed_msg"/>
<meta-data android:value="@string/fatal_error_msg" android:name="android.app.fatal_error_msg"/>
<!-- Messages maps -->
<!-- Splash screen -->
<meta-data android:resource="@layout/splash" android:name="android.app.splash_screen"/>
<!-- Splash screen -->
</activity>
</application>
<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="19"/>
<supports-screens android:smallScreens="true" android:anyDensity="true" android:largeScreens="true" android:normalScreens="true"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
</manifest>@

[jamesLee]

me too.